General advice
following must be done before fault trac-
ing continues, to avoid changing functional sensors:
If there is an active / inactive fault code
Remove the connector from the sensor. Check that
there is no oxidation and that the connector pins are
not damaged.
If there is a fault, please refer to the instructions in Fault
tracing of cables and connectors page 62.
NOTICE! Some fault codes become inactive when the
engine is stopped. Start the engine to check whether
the fault code is still inactive with the engine running.
After an action with the connector
Put the connector back. Check if the fault code
becomes inactive.
Check faults that could be related to that specific sen-
If the fault remains, measure the cables and sensors
to check them, as instructed.
The system has two types of communication buses.
A data link (CAN bus) links the nodes to each other.
CAN (“Controller Area Network”) is an industrial stand-
ard for distributed systems.
The CAN bus consists of a pair of copper conductors
which are twisted 30 times per meter. The nodes com-
municate via the CAN bus and they form a network
together, which exchanges information and benefits
from each other’s services.
The CAN bus is a serial bus and is the primary control
The communication bus, J1587, is also used for acces-
sories and for diagnostics.
This is a serial bus in accordance with standard SAE
30-0 General
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